Manufacture, centrifugally, of pipes, columns, and the like



22' 1927. March c. M s. URE

MANUFACTURE, CENTRIFUGAL-LY, 0F PIPES, COLUMNS, AND THE LIKE Filed July 12, 1926 2 Sheets-Sheet 1 1,622,012 March 229 I c McG URE MANUFACTURE. CENTRIFUGAL-LY, OF PIPES, COLUMNS, AND THE-LIKE Filed y 2, 1926 2 She ets-Sheet 2 Ill Patented Mar. 22, 192?.

STATES PATENT @FHQE.

COLIN MGGREGOB URE, OF BIfSHOPBRIG-GS, GLASGOW, SCOTLAND.

MANUFACTURE, CENTRIFUGALLY, OF PIPES, COLUMNS, AND THE LIKE. 7

Application filed July 12, 1926, Serial N 0. 121,911, and in Great Britain August 4, 1925.

This invention relates to the manufacture, ccntrifngally, of pipes, columns, and the like with branches and more particularly with branches which are hollow.

According to the invention such articles are produced by spinning plastic material within a mould having a peripheral pocket or ockets which in contradistinction to those of known moulds for a like purpose are not divided and hence not effected by separation of the mould parts.

If the branch or branches to be produced is or are hollow, a former is employed in said pocket or each pocket which differs from known formers in that it does not enter the mould beyondpor substantially be yond, the surface which represents the exterior formation of the pipe or the like, in order that the usual practice of spinning a plain pipe or the like may be retained when producing hollow branched articles. In practice the cavity around the former is first filled up, as by hand trowelling. Then the material is distributed along the axis of the mould while spinning the mould. After the article has become sufliciently set the membrane of material that separates the interior of the branch from the interior of the body proper is cut through in any suitable way.

To enable the invention to be better un-- derstood, however, it will now be further described with the aid of the accompanying drawings, whereof Fig. 1 is an elevation of a mould suitable in the instance selected for illustration, for the manufacture of a pipe with two inclined branches. Fig. 2 is an end view corresponding thereto. Fig. 3 is a plan of the remote edge of the lower mould half of Fig. 1. Fig. 4 is a vertical section of part of Fig. 1 to a larger scale. Fig. 5 is a view similar to Fig. l showing Withdrawal means applied thereto and Fig. 6 is an end view of the same.

As here shown, 1 and 2 represent the halves or two sections of a mould of generally well known type clamped together by bolts applied at positions 3. In addition the section 2' is provided at each end with steady pegs and starting screws, one at each side, as indicated at 4 and 5 respectively. The section 1 has a pocket 6 and section 2 a pocket 7 each conforming to the external configuration of a socket branch to be pro duced and each having an opening 8 corresponding to the internal diameter of the socket port-ion of the branch. The former which determines the interior configuration of the branch is in this instance a hollow men'iber 9 of two diameters as clearly shown in t and 5,10 being a flange by which it can be rigidly held in position in the pocket after insertion through the hole 8.

To facilitate withdrawal of the former 5), it may be formed with two ledges 11 beneath which can be engaged the ends of a cross bar 12, rotary movement after engagement has been properly effected being limited by stops 13. A. bolt 14 secured to the cross bar 12 extends loosely through a bridge piece 15, the feet 16 hearing against the adjacent part of the pocket 6 or 7. If therefore the nut shown at 17 be appropriately turned after liberation of the former 9, the former can be powerfully drawn out. If desired the flange 10 of the former may be recessed to position the feet 16 of the bridge piece 15, although this is not essential.

The mode of manufacturing concrete pipes in such a mould is the same Whether two branches or a single branch is to be formed except that in the latter case one pocket may be kept filled with concrete to constitute a dummy yet preserve the necessary centrifugal balance which the high speeds that are employed call for. After the parts have been assembled and the pocket or pockets filled the mould is set in motion and the pipe proper then produced in any of the usual ways. Later the mould is set aside and the branch former or formers 9 re moved whereupon the concrete that has to be removed to establish communication be tween the branch or branches and pipe is cut through. When the concrete is set suiiiciently the mould can be stripped off. As will be obvious the number of branches and the angle that the same may make with the pipe can be varied. Further it will also be apparent that other hollow bodies such as columns with arms may be produced. If desired, metal reinforcement may be em ployed.

.Vhat I claim is 1. A. centrifugal casting mould of the kind described comprising rotatable and ion gitudinally separable parts and pocket means peripherally arranged so as not to be affected by separation of the mould parts, such pocket means being adapted for branch formation.

2. In a centrifugal casting mould, a mem her having a main body portion and a pocket extending peripherally therefrom, and a former adapted to be inserted in said pocket, such former being so dimensioned that it does not enter the mould substantially be yond the surface which represents the exterior formation of the part of the article cast in the main body portion of the mould.

3. In a centrifugal casting mould, a pocket adapted for the production of a hollow branch, a former inserted in such pocket prior to casting and means adapted to react by pull and push between the branch pocket and former to remove the latter after casting, said means being removable from both the former and the pocket.

at. The herein described method of manufacturing, centrifugally a branch pipe which consists in casting the body and branch With a diaphragm separating the interior of the branch from the interior of the body and subsequently, after the article has set, cutting away such diaphragm.

Signed at Glasgow, Scotland, this 29th day of June, 1926.

COLIN MoGR-EGOR URE. 

